Sita ConSpector Manuel utilisateur

SITA Messtechnik GmbH

- Operating Instructions -

SITA Messtechnik GmbH – Operating Instructions SITA ConSpector

Contents

1Intended use .......................................................................................... 2

2Fluorescence measurement for monitoring bath contamination....................... 4

2.1 Measurement procedures.................................................................................... 4

2.2 Examples of Applications..................................................................................... 5

3Quick-start ............................................................................................ 8

3.1 Sampling ........................................................................................................... 8

3.2 Perform measurement......................................................................................... 8

3.3 Checking the device (short description) ................................................................ 9

3.4 Cleaning (short description)................................................................................. 9

4Getting to know the device..................................................................... 11

4.1 Design............................................................................................................. 11

4.2 Immersion probe .............................................................................................. 12

4.3 Power supply.................................................................................................... 13

4.4 Display ............................................................................................................ 13

4.5 Keyboard......................................................................................................... 15

4.6 Setting device options ....................................................................................... 15

5Putting the SITA ConSpector into Operation .............................................. 17

6Profiles and Profile settings ..................................................................... 20

6.1 Measurement of fluorescence intensity in RFU..................................................... 20

6.2 User-defined output – ContLevel ........................................................................ 22

6.3 User-defined output – e. g. Concentration .......................................................... 23

7Saving and readout of measuring data..................................................... 24

8Maintenance and Troubleshooting........................................................... 25

8.1 Device inspection ............................................................................................. 26

8.2 Cleaning the Immersion Probe........................................................................... 31

8.3 Adjustment of the Sensor................................................................................... 32

8.4 Replacing the battery ........................................................................................ 33

9Technical data ..................................................................................... 34

10 FAQ / Frequently asked questions ........................................................... 35

11 Transport, Disposal............................................................................... 37

12 Windows software SITA-ProcessLog.......................................................... 38

13 Appendix............................................................................................. 41

14 Admin Code ........................................................................................ 42

SITA Messtechnik GmbH - Operating Instructions SITA ConSpector

1Intended use

Please read these instructions completely before use and follow the safety instructions. No warranty

or liability will be accepted by SITA Messtechnik GmbH for any damage caused by improper han-

dling of the device or its components. Pay special attention to the following information:

Check the intactness of the device and the accessories and the compliance with the scope of

delivery and the packing list immediately after receipt.

Keep these operating instructions handy for all users.

Use the device for no other purposes than that specified in these operating instructions. Any other

use may cause hazards or damage. No liability for such damage will be accepted by the manu-

facturer. The user will bear the risk exclusively.

Attention: The radiation emission is in a non-hazardous range (EN 62471, free

group). Nevertheless, do not expose yourself directly to the invisible ultraviolet ra-

diation emerging from the immersion sensor of the sensor head. Avoid looking di-

rectly into the ray outlet opening.

Do not open the device (exception: battery replacement, see section 8.4), otherwise all warranty

claims will be voided. Any repair of open devices usually involves higher testing and repair costs.

Read the operating instructions and additional instructions, if any, prior to installation, start-up and

maintenance

Avoid any mechanical damage, especially to the display and the light conductor but also electrical

lines.

Avoid strong light irradiation or rapid light changes during a measurement.

Only the immersion sensor should come into contact with the liquids. Make sure the sensor housing

and the basic device do not come into contact with acids/alkaline solutions as well as organic

solvents. In case of doubt, test the chemical resistance of the SITA ConSpector according to the

material specifications (see section 4.2).

Do not use the device in a corrosive environment.

Avoid any extreme stress, such as high temperature or high air humidity. Allow the cold device to

adapt to room temperature before you switch it on.

To operate the device, always use USB-conforming interfaces or the original power pack supplied.

Should problems occur, contact the manufacturer of the device or your dealer.

SITA Messtechnik GmbH – Operating Instructions SITA ConSpector

Manufacturer:

SITA Messtechnik GmbH

Gostritzer Straße 63

01217 Dresden

Germany

Phone: +49 (0)351 871 8041

Fax: +49 (0)351 871 8464

http://www.sita-process.com

e-mail: info@sita-process.com

OI Version: Rev6 (07/2022)

Valid from device firmware version 2.02

Changes in the sense of the technical advancement reserved.

SITA Messtechnik GmbH - Operating Instructions SITA ConSpector

2Fluorescence measurement for monitoring bath contamina-

tion

This manual describes the SITA ConSpector measuring device. The handy and easy-to-use device

is used for fluorescence measurement in liquids, e.g. for monitoring bath contamination in cleaning

and rinsing baths. For this purpose, the device detects residues of fluorescent impurities in the

liquid on the basis of fluorescence measurement. The measurement result is output as relative

fluorescence intensity in RFU. The unit RFU stands for Relative Fluorescence Unit and refers to the

fluorescence standards of SITA Messtechnik GmbH. The higher the measured value in RFU, the

higher the concentration of fluorescent substances.

2.1 Measurement procedures

Short description

The fluorescence of the bath contamination (e.g. drops of oil)

is excited by a UV light source. A photodiode in the sensor head

of the SITA ConSpector measures the intensity of the radiation

emitted by the fluorescence at a defined wave length in the blue

light spectrum. The strength of the fluorescence depends on the

contamination level per volume.

The SITA ConSpector works on the confocal measuring

principle. The excitation light and the light emitted by the

fluorescence follow the same parallel ray path. The

measurement of the contamination level can be easily realised

by immersing the remote immersion probe into the bath sample.

Detailed Description

Measuring principle

The fluorescence of organic contaminants (oils, greases, cooling lubricants, release agents, etc.)

is excited by a UV light source. A photodiode in the sensor head of the SITA ConSpector measures

the intensity of the radiation emitted by the fluorescence at a specified wavelength in the range of

blue light. The intensity is measured in the unit RFU (Relative Fluorescence Unit) and is related to

the SITA fluorescence standards. The lower the measured value in RFU, the lower the exposure of

the bath sample to fluorescent substances.

The fluorescence measured in the process liquid is a cumulative parameter of all fluorescent matter.

If the process bath has different types of contamination, the measured fluorescence cannot be used

to determine the kind of contamination or the individual concentration of the same. Non-fluores-

cent contamination introduced into the process bath are not detected.

Besides the continuous inspection of the bath contamination the device can also be used to meas-

ure the oil concentrations in solvent baths.

SITA Messtechnik GmbH – Operating Instructions SITA ConSpector

Fluorescence of contamination

In production aids, fluorescence is largely due to the aromatic ring systems contained in additives

but primarily also in the mineral oil itself, as well as the unsaturated structures of the oils and fats.

Carboxylic acids and their esters as well as aliphatic ketones fluoresce, too. The fluorescence

measurement detects slightest traces of fluorescent substances.

Exceptions are substances that do not fluoresce when excited with UV light. Those include some

silicon oils, saturated organic compounds as well as short unsaturated hydrocarbons, metals and

their oxides. Processing aids such as oils, greases, cooling lubricants and release agents are tech-

nical liquids that also contain numerous additives, which can likewise contribute to fluorescence.

By adding fluorescent pigments or dyes as fluorescent markers, a non-fluorescent substance can

also be detected.

Photobleaching

Photobleaching is a dynamic process in which the contamination is photochemically destroyed by

UV excitation, thereby diminishing its ability to fluoresce. The strength of the photo-bleaching effect

depends on the substance. The SITA ConSpector was designed in such a way that the sampling

time of a measuring point keeps the photo-bleaching effect as low as possible. When measuring

in a sample mixed with the magnetic stirrer, the medium is also permanently exchanged and a

photo-bleaching effect will generally not be visible.

Defining limits for bath contamination

The displayed measurement value in RFU increases with increasing bath contamination (see appli-

cation examples). Based on reference samples or empirically by the effect on the part quality, a

limit value (alarm) of the contamination level can be defined. If this limit value is exceeded, the

device issues a warning and the plant operator can immediately initiate the necessary measures.

2.2 Examples of Applications

The quick and simple monitoring of the contamination level of the process baths is used as the

basis for process optimisation and achieving high process reliability. The SITA ConSpector captures

process-related changes and allows them to be compensated for through process management

measures. An example of this is the appropriately metered addition of cleaning components and

the removal of the contamination introduced with the immersed parts through bath maintenance.

Overdosing practiced for safety reasons and the premature new bath formulation can be avoided

by monitoring the contamination level.

The following examples illustrate the connection between the fluorescence intensity in RFU output

by the SITA ConSpector and the concentration of the contamination in the bath.

SITA Messtechnik GmbH - Operating Instructions SITA ConSpector

Example 1

In this example, the process

bath is contaminated through

the introduction of oil. The in-

creasing contamination of the

bath by the oil causes the

value of the measured fluo-

rescence to increase. The fig-

ure beside shows the develop-

ment of the fluorescence in-

tensity, measured by the SITA

ConSpector, in connection

with the oil concentration in

the process bath.

The value of the measured

fluorescence intensity depends not only on the amount but also on the type of contamination. Since

the requirements for the cleaned components can also vary greatly, the limit value for the degree

of contamination of the bath must be determined individually depending on the process.

A limit value (alarm) for the degree of contamination can be defined on the basis of reference

samples or empirically through the effect on the part quality. If this limit value is exceeded, the

device issues a warning and the plant operator can immediately initiate the necessary measures.

Example 2

The following figure shows the

change of the contamination

level in relationship to the time

for an aqueous cleaning bath

with high introduction of con-

tamination and a short bath

life time of two weeks. After the

new bath preparation, the flu-

orescence intensity increased

continuously due to the impu-

rities removed from the metal

parts. Partial discarding took

place at the weekend. After an-

other five days, the contamina-

tion level rose to the previously defined limit. Subsequently, the bath was discarded and a new

approach was made.

Oil concentration in %

Fluorescence intensity in RFU

SITA Messtechnik GmbH – Operating Instructions SITA ConSpector

Example 3

In order to preserve components after solvent cleaning, corrosion protection oils are used. The

corrosion protection of the components is influenced by the concentration of the corrosion protec-

tion oil in the solvent. Since the concentration decreases due to the process, it must be monitored

and re-dosed. The first figure shows the correlation between measured fluorescence intensity and

the concentration of the corrosion protection oil in the solvent. The second figure shows measured

bath samples before and after dosing.

4261

6824

8404 9397 10030

2000

4000

6000

8000

10000

12000

14000

012345

Fluorescece intensity in RFU

Concentration Anticorit MPC 5000 in %

in Dowclene 1601

18,3

1920,1

2449,7

1718,6

500

1000

1500

2000

2500

3000

3500

Dowclene 1601 Badprobe 19.03. vor

Nachdosieren

Badprobe 19.03.

nachdosiert

Badprobe 20.03 vor

Nachdosieren

Fluorescence intensity in RFU

Dowclene 1601 +

0,25 vol.-%

MPC 5000

Dowclene 1601 +

0,75 vol.-%

MPC 5000

Dowclene 1601

Bath sample

before redosing

Bath sample

after redosing

Bath sample

before redosing

on the next day

SITA Messtechnik GmbH - Operating Instructions SITA ConSpector

3Quick-start

The quick-start chapter contains the most important information for operation, conduct-

ing a measurement and inspection of the device in abbreviated form. The single sections

of the quick-start chapter provide cross references to later chapters with more detailed

information on the respective topic.

3.1 Sampling

Take samples at a well-mixed and representative sampling location. Always carry out

measurements at the same sample temperature. Allow samples to cool down to room

temperature before starting the measurement.

3.2 Perform measurement

1. Switch on the SITA ConSpector (press -key for 2 s).

2. Choose the desired measuring profile. The active

measuring profile appears at the lower right edge of

the display. Use the arrow selection keys Liquid to

change the profile.

3. Place the stainless steel beaker filled with approx. 80 ml of the sample liquid (ap-

prox. 1 cm below the rim of the beaker) on the support surface of the magnetic

stirrer. Place a magnetic stick in the beaker and turn the rotary knob to mid posi-

tion.

4. To immerse the immersion probe into the sample liquid, lower the device holder

by using the star knob screw (see set-up in picture above). Immerse the immersion

probe approximately half way into the bath sample. The limiter should rest against

one side of the beaker.

5. Use the lid to cover the bath sample.

immersion

probe

limiter

immersion

depth

active profile

lid closed

12 o'clock position

measurement in

stainless beaker

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